﻿// https://mp.weixin.qq.com/s?__biz=MzUxNjY5NTYxNA==&mid=2247484438&idx=1&sn=52cd12bec41d3b150d9e2651e1df0418&scene=21#wechat_redirect
// 

#include <iostream>
#include <vector>
#include <string>
#include <unordered_set>
#include <map>
#include <unordered_map>
#include <algorithm>

using namespace std;

// struct ListNode {
//     int val;
//     ListNode *next;
//     ListNode() : val(0), next(nullptr) {}
//     ListNode(int x) : val(x), next(nullptr) {}
//     ListNode(int x, ListNode *next) : val(x), next(next) {}
// };

class Solution {
public:
    int reverseList(int head) {

    }
};

int main() {
    Solution obj = Solution();
}